foreign

adjective:of, from, or characteristic of a country or nation other than one's own
- She studied foreign literature to broaden her perspective on world cultures.
adjective:unfamiliar or strange; not previously experienced or known
- The new software introduced several foreign concepts that required additional training.
adjective:not native to a particular place; introduced from elsewhere, often used of plants or animals
- The park's management removed the foreign species of fish that threatened the local ecosystem.
noun:a person who comes from another country; a foreigner
- The city welcomed the foreign who arrived to study at the university.
adjective:relating to international affairs, trade, or diplomacy
- He pursued a career in foreign policy after graduating from the School of International Relations.